Process for the making of an insulating and protective coating



COATING UH lLAS I IU.

UNITED STATE silicon in the carbid 0 l /til Irv "L/ l S/PATENT OFFICE.

EDWARD R. STOWELL, 0F PORTLAND, INDIANA, ASSIGNOR T0 STOWELL FIRE- PROOFING COMPANY, OF MANISTEE, MICHIGAN, A CORPORATION OF DELA- WARE.

PROCESS FOR THE MAKING OF AN INSULATING AND PROTECTIVE COATING.

Specification of Letters Patent.

Patented Aug. 24, 1920.

No Drawing. Application filed July 1, 1918, Serial No. 242,852. Renewed April 10, 1920. Serial No.

To all whom it may concern:

Be it known that I, EDWARD R. SrowELL, a citizen of the United States, and a resident of Portland, in the county of Emmet, State of Indiana, have invented and discovered a new and useful process for the making of an insulating and protective coating for application to in furnaces, ovens. kilns, etc., and for application 0 sup .1 i can surfaces and to any surface exposed to acid and acid-fumes, corrosive gases, and extreme high temperatures. This said coating will seal the expansion and other gra ref Y iniiws. prevent infiltration of cold air, prevent absorption of heat by linings and the loss of heat by radiations to a great extent, save fuel, and increase the life of linings and other surfaces to which applied.

The process is applied in practice as follows :In four gallons of water shot water preferably) dissolve one poun o soc ium hvdroxid and place this solution mm sel of at least thirty gallons capacity. For each gallon of this caustic solution use eight pounds of finely powdered ca, rbid of silicon. Put this powder in the container in m eight to ten pounds each and stir bris 7 v, incorporate the specified amount iii tiis inanner. Cover the container, but not air tight, and let set for a few hours. The between the soda-Ive and the fr e2 s1 icon ill cause o en as to form and this in t-u' the composition has ceased to form gas and to foam it should be stirred down to the consistencyof a thick paint or paste and to this is added one pint of 50 to 54 degree sodium silicate for each gallon of the composition.

Sufiicient sodium silicate having been added to make the composition the consistency of a very thick paint, it may be packed in sealed containers and marketed for the purposes specified.

Having described this process, what I claim as my invention and discovery and wish to secure by Letters Patent, is-

1. The herein described process for making a high temperature insulating and protective coating by treating carbid of silicon in a solution of sodium hydroxid (soda-lye) and then mixing same with sodium silicate.

2. The herein described process for the making of a refractory and protective coating by combining sodium hydroxid with water, adding to each gallon of this lye solution approximately eight pounds of powdered carbid of silicon, incorporate well, let stand in covered container of sufficient capacity until the hydrogen gas formed by the action of the free alkali on the free silicon in the composition is exhausted, stirring the foam like composition which will result until it is reduced to the original quantity and then adding one pint of 50 to 54 degree sodium silicate to each gallon of the composition as thus formed.

In testimony whereof I have subscribed my name in the presence of two subscribing witnesses.

EDIVARD R. STOWELL. [L. s.]

\Vitnesses JOHN AUSTIN, VOLNEY POWELL. 

